Nedrum was born in Sweden.  His Norwegian parents were resistance fighters who fled German-occupied Norway to Helsingborg, Sweden, during World War II, where Nedrum was subsequently born.  At the end of the war, Nerdom returned to Norway with his parents.  In 1950, Nedrum's parents separated, leaving his mother to raise Od and his younger brother.  In 1993, Nedrum found out that his father was not his biological father.  His mother had a relationship with architect David Sandwood.  Nerdrum was born from this interface.